Thansk for the answer, I didn't notice this part of the doc. In fact the (make-hasheq) doesn't fit because the objects needs to be inspect with equal? to find a match. It seems it is not possible this way, as writted in the doc. Thanks anyway.
> From the docs (3.13 Hash Tables): > Caveat concerning mutable keys: If a key in an equal?-based hash table is > mutated (e.g., a key string is modified with string-set!), then the hash > table’s behavior for insertion and lookup operations becomes unpredictable. > > Try make-hasheq instead of make-hash, that should work here. > > > > On Fri, 19 Oct 2012 17:57:41 +0200, Ted <ted...@gmail.com> wrote: > > > Hi the list, > > I was wondering for my midi/osc -> event mapping project if it was > > possible to put objects instances (with racket/class) as hash keys. > > I tried and it worked. The problem is, I pushed further and when I > > change object fields, the hash can't find my key anymore, despite I see > > it in. > > > > For the record: > > > > (require racket/class) > > > > (define test% > > (class object% > > (inspect #f) > > (init-field > > address > > ) > > (define/public (getAddress) > > address > > ) > > (define/public (setAddress n) > > (set! address n) > > ) > > (super-new) > > ) > > ) > > > > (define testy (new test% (address 12))) > > (define testH (make-hash)) > > (hash-set! testH testy (send testy getAddress)) > > > >> testH > > #hash((#(struct:object:test% 12) . 12)) > > > >> (send testy setAddress 13) > >> testH > > #hash((#(struct:object:test% 13) . 12)) > >> (hash-has-key testH testy) > > #f > >> (hash-ref testH testy) > > hash-ref: no value found for key: (object:test% 13) > > > > That's an odd response. I know it's an odd request too, but if anyone > > could help me on this, even it I have to use an other solution. > > > > Thanks in advance. > > > > Ted > > ____________________ > Racket Users list: > http://lists.racket-lang.org/users
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